I’m Li Yun, a linguist. I devoted my life to communicating with unknown civilizations, until we actually found one beneath the Antarctic ice. We thought we were making contact, so we broadcast a synthesized greeting into the abyss. We were wrong. That low-frequency “echo” wasn’t language at all. It was a mental plague. Now it speaks inside my head. It shows me knowledge I can’t comprehend, at the cost of my sanity. My teammates have either gone mad or become its puppets, murmuring ritual prayers of madness. Team leader Carter only cares about that damn “knowledge.” Only Dr. Mark and I are still trying to stay sane. But what can we possibly stop? The entire outpost beneath our feet has become a vast resonating chamber, and we are the lambs on the altar. Don’t listen to this frequency... because once it enters your mind, it will never leave.